A couple of new papers in J. Neuroscience relevant to speech recognition in multi-talker environments. I haven't read them yet but both look interesting. More soon...
Attentional Gain Control of Ongoing Cortical Speech Representations in a
Jess R. Kerlin, Antoine J. Shahin, and Lee M. Miller
J. Neurosci. 2010;30 620-628
How the Human Brain Recognizes Speech in the Context of Changing Speakers
Katharina von Kriegstein, David R. R. Smith, Roy D. Patterson, Stefan J.
Kiebel, and Timothy D. Griffiths
J. Neurosci. 2010;30 629-638